[Answer] What is the largest office building in the United States by total area?

Step 1 : Introduction to the question "What is the largest office building in the United States by total area?"

...The Pentagon, located in Arlington, Virginia, is the largest office building in the United States by total floor area. Completed in 1943 during World War II, it serves as the headquarters of the U.S. Department of Defense. The massive building covers approximately 6.5 million square feet, with about 3.7 million square feet of that space used as offices. Despite its relatively modest height, its sprawling five-sided design, extensive layout, and vast corridors make it unparalleled in size, accommodating over 20,000 military and civilian employees.

Step 2 : Answer to the question "What is the largest office building in the United States by total area?"

The Pentagon:

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